Spring-tooth harrow



(No Model.)

A. 0. BEMENT.

SPRING TGOTH HARROW. No. 272,939 Patented; Feb.2'7,1883.

WITNESSES} Hum/r01? @MQLE Q L m' X M M Amy UNITED STATES PATENT, OFFICE.

ARTHUR O. BEMENT, OF LANSING, MICHIGAN.

SPRING-TOOTH HARROW.

SPECIFICATION forming part of Letters Patent No. 272,939, dated February 27, 1883.

' 1 Application filed May 31, 1882. (No model.)

To an whom it may concern Be it known that I, ARTHUR O. BEMENT, of Lansing, county of Ingham, State of Michigan, have invented a new and useful Improve- 5 ment in Spring Tooth Harrows; and I declare the following to he a full, clear, and exact description of the same, such as will enable othersslrilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form a part of this specification.

My invention consists in the combinations of devices and appliances hereinafter specilied, and more particularly pointed out in the claims.

In the drawings, Figure his a view in perspective of a device embodying my invention. Fig. 2 is a separate view of the plate. Fig. 3 is a separate view 0t ings.

The object of my invention is to provide means for changing the pitch of a spring harrow-tooth, so that it may be readily adjusted for soft or hard ground to give the proper depth of cut.

This invention is designed more specifically as an improvement on a spring barrow-tooth patented by David L. Gauer, January 22, 1878,

.No. 199,430; and it consists in a novel arrangement of an independently-adjustable plate under the spring-tooth and in such relation thereto that by adjusting said plate the point of the tooth may be raised or lowered or thrown to front or rear, as desired, for the 5 purpose of regulating the cut.

It also consists in a novel construction and combination of devices for securing the tooth to the harrow-beam,all as hereinafter particularly described.

In the accompanying drawings, A represents a bar or beam of a harrow.

B is the spring barrow-tooth, provided with the eye 12.

O is the torsional spiral spring, with the U- 4 shaped central portion, 0.

D is the bolt passing through the eye of the spring.

d is an eyebolt and d a hook, whereby the bolt D is secured to the beams of the harrow.

0' The bolt D is threaded at one end and squared at the other, and is thus adapted to be inthe bolt and its fastenserted under the hook d and screwed into the eyebolt (I.

E is a metallic plate, located under the tooth and provided with elongated slots 0 6, through which the plate may be bolted to the bars A. The slots are so constructed that the plate may be caused to slide back and forth, so as to project the point of the tooth forward or backward, as may be desired, for varying the depth of cut. The plate E is adjustable independentl y of the fastening devices of the tooth,

and may be applied readily to a harrow already constructed and in use.

The employment of the adjustable plate is not necessarily limited to a hinged tooth such as is shown, for it is equally applicable with any other form of tooth for effecting the same adjustment of the depth of cut.

I am aware that spring-tooth harrows have been provided with adjustable plates for raising and lowering the teeth, and I do not claim such construction, broadly.

, What I claim as new, and desire to have patented, is-

l. The combination, with the curved spring barrow-tooth arranged in the angle formed by the cross-bars of the frame, and having its inner end secured to said bars, of the independcntly-adjustable plate E, arranged under and in contact with said barrow-tooth, and supported by the frame-bars, substantially as and for the purpose set forth.

2. The combination, with the bars of the barrow-frame and the spring-tooth B, of the torsional springO, having the loop 0, arranged to bear upon the upper surface of said tooth, the bolt D, arranged through the eye of said torsional spring, said bolt being screw-threaded at one end and squared at the other, and

the hook at and eyebolt 61, adapted to engage the ends of said bolt, respectively, and having their shanks passed through the frame-bars, substantially as described.

In testimony whereof I sign this specification in the presence of two witnesses.

ARTHUR O. BEMENT.

Witnesses:

,ARTHUR T. DAVIS, ORSON A. MILLER. 

